Volumn Content

Steelmaking 2007 Vol.23 Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Recent Progress in Oxide Metallurgy Technology and its Application LIU Zhong-zhu;Mamoru KUWABARA Steelmaking    2007, 23 (04): 1-6.   Abstract （3254）            Knowledge map    Save The background of the proposition and development of Oxide Metallurgy Technology has been reviewed. The main concepts of that technology and its effects on the microstructure and performances of steel have been introduced. The recent progresses in pinning the grain growth at elevated temperature and nucleating the inter-granular ferrite from austenite, especially its mechanisms, have been summarized. The newly developed application of that technology in high heat input welding, rapid solidification and rolling processes, as well as in hot forged steel and heavy steel have also introduced. The developing trend of that technology has been forecasted. Related Articles | Metrics Select Practice on mould level fluctuation control of vertical-bending type caster in refining peritectic steel SONG Ze-qi;CHEN Qing-quan;ZHANG You-hua Steelmaking    2007, 23 (04): 7-10，1.   Abstract （1976）            Knowledge map    Save The present paper analyzed the cause to the mould level fluctuation of vertical-bending type caster in casting the peritectic steel, and introduced the solution to the problem at No.2 steelmaking plant of WISCO including adjustment of the mould cooling and secondary cooling schedules, use of special casting powder and increase in the drawing force and etc. Related Articles | Metrics Cited: Baidu(10) Select Practice in refining 40Cr by converter Steelmaking    2007, 23 (04): 11-13.   Abstract （855）            Knowledge map    Save The present paper introduces the product properties of the round bar out of the 40Cr steel refined and rolled through the converter-LF reefing-Concasting process route. Related Articles | Metrics Select Development and modification of air blow deslagging technology for hot metal desulfurization in ladle Liu Xiao-qing;Tao yong-gang;Wang Qing-fang;Du Xiu-feng;Pan Yan-hua Steelmaking    2007, 23 (04): 14-17.   Abstract （2299）            Knowledge map    Save In hot metal desulfurization by pure Mg, problems frequently occur such as insufficient quantity of slag, high sulfur content and less flow-ability in slag , long time span for deslagging (up to 11 minutes) and heavy iron loss (up to 5 kg/t Fe), high resulfurization in steelmaking (up to w(S) 0.005 1 %) in NO.1 Steel-making Plant of WISCO. In order to solve those problems some technological measures have been taken in the Plant The efficiency of hot metal deslagging has been greatly improved ever since by adoption of the air-blow aided deslagging technology in which the air bubbling elements such as porous bricks are installed in the bottom of the ladle, properly selection of material for the air bubbling elements as well as appropriate selection of the installation position and continuously improvement of the technology in the actual production. As the results the average deslaggig time is cut to less than 7 minutes, average iron loss in deslagging declined from 5 kg/tFe to 3.5kg/tFe, average sulphur pick-up is declined from w(S) 0.005 1 % to w(S) 0.002 %,average life length is extended up to 110 . Related Articles | Metrics Select Optimization of Secondary Cooling Water Calculation at The No.1 Slab Caster in Bayi Steel Steelmaking    2007, 23 (04): 18-21.   Abstract （1725）            Knowledge map    Save Based on analysis on the practical operation conditions in continuously casting steels Q235B and 08Al respectively in the No.1 Slab Caster of Sinkiang Bayi Steel, the secondary cooling water has been optimized by the universal static simulation software of slab continuous casting CCPS OFFLINE, which has been adopted in the actual casting process. From the production results it can be known that, the quality of slab (especially Tri-angle-zone crack) under the condition of the optimized secondary cooling water has been improved distinctly. It strongly demonstrates that the optimized secondary cooling water, obtained from the numerical heat-transfer & solidification simulation of slab continuous casting, has good reasonability and adaptability, and the simulation software can be widely used in design of the secondary cooling water for slab caster. Related Articles | Metrics Select Optimization of secondary cooling scheme for bloom continuous casting of WISCO Steelmaking    2007, 23 (04): 22-24，4.   Abstract （1926）            Knowledge map    Save on the base of the bloom of No.1 Steelmaking Plant of WISCO, mathematical models of solidification and heat transfer for bloom have been established. According to requirements of metallurgical criteria for bloom solidifying process , the relation between secondary cooling water flux and casting speed were regressed. The new control model of secondary cooling water was established ,The bloom quality has been improved obviously since application of the new cooling water control model to actual production. Related Articles | Metrics Cited: Baidu(4) Select Study on intermedium cracks of continuous casting slab and improvement practice Steelmaking    2007, 23 (04): 25-28.   Abstract （1927）            Knowledge map    Save The type and cause to the formation of the intermedium cracks of the continuous casting slab are analyzed by macro examination and SEM and measures to eliminate the inter- medium cracks are put forward including compositions of the steel,secondary cooling schedule, pressure of driving rollers, soft reduction and support segments. Results show that the sulfur content of steel and support segments are main factors leading to the intermedium cracks. Since adoption of the improvement measures, the rate of the intermedium crack occurrence has been obviously descended. Related Articles | Metrics Cited: Baidu(12) Select Analysis on application of waste steel in converter refining Steelmaking    2007, 23 (04): 29-32.   Abstract （752）            Knowledge map    Save The waste slag steel is one of the main products out of the treatment of the converter steel slag. In the past this kind of waste steel was not properly used due to insufficient research on this subject 。In the No.2 Seel-making Plant of Jinan Iron & Steel Co., production experiments have been carried out in which the waste slag steel is directly added into the converter in lieu of the steel scraps. The effects of the slag steel on the converter steel-making as well as its economic efficiencies are analyzed. This new technology can contribute greatly to the reuse of the wastes and development of recyling economy. Related Articles | Metrics Cited: Baidu(2) Select Fluid flow control for a single-strand tundish in slab continuous casting Steelmaking    2007, 23 (04): 33-35.   Abstract （720）            Knowledge map    Save Fluid flow in the single-strand tundish with different configuration in slab continuous casting at Nanjing Iron & Steel Co., had been studied in water modeling experiment to optimize the tundish configuration. With the optimal tundish configuration, the minimum residence time of liquid steel is increased by 1.2 times, the peak concentration time is increased by 97 %, and the dead volume fraction is decreased by 72 %. The experimental results showed that the special border turbulence inhibitor developed in the research can improve the flow characteristics parameters and fluid flow in the tundish greatly. It was shown from the results of industrial application that the inclusion area ratio of slab decreased by 32 % with the optimal tundish configuration. Related Articles | Metrics Cited: Baidu(4) Select Research on T91 steel refining technology through EAF-LF-VD process route Steelmaking    2007, 23 (04): 36-38，4.   Abstract （1975）            Knowledge map    Save The present paper studies the process adoptd in refining T91 steel through EAF-LF-VD processing route. To ensure the qualified content of [C] and [P] in liquid steel in the down stream processing steps, it’s of great neccesity to control the content of w(C) and w(P ) separately in 0.02 % and 0.004 %. By appropriately drawing up the alloy schedule and selecting the right alloy elements in LF process, the alloy content in liquid steel can be controlled within the specified limit.. By means of desulphurization in LF and VD vaccuum treatment the w(S ) content in steel can be reduced to below 0.005 %. Research indicates that refining T91 steel by this process is acceptable. Related Articles | Metrics Cited: Baidu(10) Select Study on composition of furnace charges in contemporary Steel-making flow route Steelmaking    2007, 23 (04): 39-42.   Abstract （1678）            Knowledge map    Save The BOF process route and EAF proces route are the main steelmaking process route today. Based on the calculation of material balance and heat balance, and on the analysis of tap to tap time, the conclusion can be made that there are an optimal proportion of hot metal charging in EAF steelmaking and an optimal proportion of cool metal charging in BOF steelmaking. For the NO.1 steelmaking and rolling mill of Anyang Iron and Steel Co.，Ltd.，the optimal proportion of hot metal charging in 100 t Shaft EAF is 31 % and the optimal proportion of cool metal charging with full scrap in 100 t BOF is 17 %. Related Articles | Metrics Select Research and erosive mechanism analysis of advanced magnesite-chrome brick for RH furnace Steelmaking    2007, 23 (04): 43-46.   Abstract （1967）            Knowledge map    Save An advanced magnesite-chrome brick with good corrosion resistance and peel-off resistance is produced using the fused magnesite-chrome clinker and fused magnesia sand as the raw materials by means of refining matrix and richening matrix with Cr2O3. The microstructures of the original and residual bricks are anatomized and analyzed in detail through OM and SEM. The microstructure and corrosion mechanism of the original and residual brick are approached visually by “image as data”. Related Articles | Metrics Cited: Baidu(4) Select Intelligent prediction modeling and application research on the Angang FSF electrode Steelmaking    2007, 23 (04): 47-51.   Abstract （900）            Knowledge map    Save The electrode control system of alternating current electrical arc furnace is a multi-variable, nonlinear, parameter-time-varying and complicated strong coupling system and the classic control strategy is hard to acquire the good performance. Proceeding from actual application of FSF electrode control a variable structure Elman neural network prediction model is proposed based on a new hybrid generic algorithm in this paper.. This improvized hybrid generic algorithm can simultaneously and dynamically optimize the network structure, the weights and self-feedback gain .The improvized BP algorithm based Elman neural network and the variable structure Elman neural network proposed in this paper are both applied in identification of the electrode model. The simulation experiment based on the on-site data of Anyang Steel indicate that the structure variable Elman neural network overcomes the problem of complex network structure, which is brought by the complexity of electrode control system and limitation of weights by BP algorithm. The proposed method based on a new hybrid generic algorithm is of better identification performance ,better dynamic characteristic, quicker approach speed and better precision. Finally,the model applied in parameter tuning of electrode control system obtains the good control result，thus providing a solid theoretical basis for electrode control. Related Articles | Metrics Select Application and numerical simulation on the wall design optimization for tundish Steelmaking    2007, 23 (04): 52-55.   Abstract （2133）            Knowledge map    Save With the purpose to bring down the inclusions rating of the steel billets through effective tundish wall design, 3-D numerical simulations have been carried out on the flow dynamic processes in the tundish of 4-strand CC in the 3rd Steel Plant Shougang and the effect of the flow field of liquid steel on the removal of inclusions in steel analyzed. Results of simulation and actual production show that by installation of high walls in the tundish inclusions can be reduced and V- shaped wall is more dependable and by use of the full wall with flow guiding orifices the inclusions can be more effectively removed since the flow field of the liquid steel is more appropriately distributed in the tundish. Related Articles | Metrics Cited: Baidu(3) Select Method of controlling solidification quality in electroslag remelting process Steelmaking    2007, 23 (04): 56-58，6.   Abstract （725）            Knowledge map    Save The different parameters symbolizing solidification quality and effect of solidification process parameters on solidification quality are analyzed. Relation between melting rate and solidification quality and how the reasonable melting rate is obtained is discussed. It’s an effective method to obtain reasonable solidification structure by computing temperature field and the secondary dendrite arm spacing using mathematical model. Related Articles | Metrics Cited: Baidu(14) Select Development of mold flux heavy rail steel at PZHISC Steelmaking    2007, 23 (04): 59-62.   Abstract （1713）            Knowledge map    Save In conjunction with the No.1 bloom caster process conditions in Panzhihua Iron and steel Company (PZHISC)，the present paper studies improvement in the lubrication performance and the melting uniformity of the flux by adding special constituents into the mold flux as the key elements and also discusses the suitable carbon mixing pattern for the mold flux. Industry tests show that the newly developed mold flux for heavy rail steels in possession of good performance well meets heavy rail steels production requirements of PZHISC No.1 bloom caster. Related Articles | Metrics Select Development and application of converter steel slag disposal technology LIN Dong;TAO Li-qun;TAN Ming-xiang;PENG Fei;DONG Zhi-peng Steelmaking    2007, 23 (05): 1-4.   Abstract （769）            Knowledge map    Save Practical results show that the rotating wheel type water quenching disposal of steel slag technology developed by Bengang is of great safety and reliability, in which the slag is very well separated from the liquid steel and the slag disposal rate reaches as high as 8 t/min. Moreover the process layout is compact; the structure of the main equipments for the process is simple and plant area needed for this subject is small; the speed of the hydraulic tilting pot for the steel slag granulation purpose is adjustable; the controllable range of the granulation cycle is relatively great (within 5 to 15 minutes) and the grain sizes of the steel slag after water quenching are rather homogeneous and of the total slag those in the grain size of less than 5 mm account for over 95%. All those advantages are of great benefits to further application of the steel slag. Related Articles | Metrics Cited: Baidu(2) Select Application of argonblow technology in cold heading steel YU Xin-he;WANG Jin-ping;ZHAO Ji-yu;CHEN Gang Steelmaking    2007, 23 (05): 5-8.   Abstract （2195）            Knowledge map    Save The present paper introduces the development and improvisation of the overall process of argon blowing in the NO.1 Steelmaking Plant of WISCO, in which the refining processes including slagformation, slag modification, Catreatment and temperature regulation originally carried out in LF are currently accomplished in the Argon Blowing Station. Very satisfactory castability has been achieved and the production cost remarkably cut down in application of the new technology. Analytical results show that the slag melting and inclusion control in steel in refining the cold heading steel by application of the optimized argon blow technology are similar to and even superior over the original LF process. Related Articles | Metrics Select Practice in production of extralow carbon steel by RH treatment ZHANG Zong-ning;YUE Ke-xiang Steelmaking    2007, 23 (05): 9-12.   Abstract （1808）            Knowledge map    Save According to the low carbon steel production data acquired in the practical production in Ma'anshan Iron & Steel Works from January to June 2006 the RH circulation flow and circulation coefficient are calculated and their effects on end point carbon content analyzed as well. Analytical results show that final w(C) shall be less than 0.005 %, circulation factor greater than 4 and the minimum treatment time 13.32 minutes. In the meanwhile it's found out that the modified slag of LD,RHKTB is in possession of certain desulphurizing capacity. Related Articles | Metrics Select Optimization of oxygen lance nozzle for BOF GAO Wen-fang;ZHANG Jian-jun;CHEN Gang;YI Wei-don;LI Qiang;ZOU Zong-shu Steelmaking    2007, 23 (05): 13-17.   Abstract （1809）            Knowledge map    Save The present paper describes the parameter design, water model test and production test of the oxygen lance nozzle for the 125 t topbottom combined blown converter. Results show that the oxygen supply capacity for the optimized 5hole oxygen lance is prominently increased and the oxygen blowing process goes on smoothly with fast formation of slag and less splashing. Therefore the optimized lance nozzle can basically meet requirements of the refining operation after the volume expansion of the converter. Related Articles | Metrics Cited: Baidu(2) Select Study on variation of oxygen content in LD→LF→CC process ZANG Xiao-jun;PAN Xue-jun;ZHU Li-yun Steelmaking    2007, 23 (05): 18-20，3.   Abstract （1782）            Knowledge map    Save The law of variation of oxygen content in LD→LF→CC process in Linfen Steel Works has been studied. By way of sampling and analyzing the nitrogen and oxygen specimen and by metallographic observation and analysis on the inclusions extracted by electrolysis the general level of the oxygen content in steel in the abovementioned process has been determined and the major factors affecting further improvement in the hot metal quality found out and recommendations for improvement put forward. Related Articles | Metrics Select Analysis and study on central crack in continuously rolled billets of low alloy steel LEI Hong-bo;XU Gang;XUE Jun;GUO Chun-yuan;YE Yin-peng;MA Cheng;CAO Wei-hua;NING Dong Steelmaking    2007, 23 (05): 21-23，4.   Abstract （2095）            Knowledge map    Save The present paper introduces the production technologies of the continuously rolled billets of low alloy steel and the examination method of their internal quality, analyzes the central cracks in the continuously rolled billets and determines the primary defect of the billets (that is central crack) and finds out the primary cause leading to the central crack and thereupon puts forward the measures to check and reduce the central crack and then carries out a series of production tests to examine those measures. Experimental results show that by taking those measures and methods the central cracks in the billets can be effectively checked and reduced. Related Articles | Metrics Select Study on characteristics of liquid core reduction process in TSCR SU Liang;TIAN Nai-yuan Steelmaking    2007, 23 (05): 24-26.   Abstract （1825）            Knowledge map    Save The present paper briefly introduces the liquid core reduction process during thin slab continuously casting and compares the technique of liquid core reduction with that of soft reduction. In light of the technological characteristics of the liquid core reduction process for the thin slab continuous casting it also analyzes the structure of the continuous casting machine in which the new process is adopted and reaches the conclusion that appropriate process prerequisites for the liquid core reduction technique in thin slab CC are of great significance for application of this technology. Related Articles | Metrics Cited: Baidu(1) Select Study on quality control of high grade hull structure steel LIU Dan-mei;BAO Yan-ping;YUE Feng;XIAO Da-heng;CHEN Qi-ming Steelmaking    2007, 23 (05): 27-31.   Abstract （1815）            Knowledge map    Save In order to satisfy the requirements of Egrade hull plate for high quality slab a series of technical measures such as deep desulphurization by hot metal pretreatment, deoxidation and desulphurization by ladle refining and modification of inclusions by feeding Caclad wire into the ladle furnace have been taken to improve the cleanliness of the hot metal and raise toughness of the high grade hull plate. It's found out in the experiments that the toughness of the Egrade steel can be raised prominently providing that w(S) is controlled within the limit of less than 0.005% and the modification of inclusions can be accomplished so long as w(Al) is defined in the range of 0.03% to 0.04% and ratio of m(Ca)/m(Al) is controlled in about 0.1. Production results show that by way of control of sulphur and oxygen contents in a very low level and adoption of Ca treatment process the cleanliness of the hot metal and the quality of the Egrade hull plate can be ensured as the strength and toughness of the steel are raised. Related Articles | Metrics Cited: Baidu(4) Select Mathematical simulation of cake shape in spray forming process LI Xiao-hong;REN San-bing;LE Hai-rong;FAN Jun-fei Steelmaking    2007, 23 (05): 32-36.   Abstract （1923）            Knowledge map    Save A 3dimension model depicting the dynamic growth of the geometrical outline of a cake slab in the process of spray forming has been built up. The influence of various processing parameters such as atomization characteristic value of the nozzle, eccentric distance, rotation speed and withdraw speed of the substrate in the process of spray forming have been fully considered in building up the model. By data processing after calculation a 3dimensional profile of the growth of a cake slab has been obtained. By comparison of the above mentioned profile with that of the cake slab produced by the physical spray forming equipment it's proved that the two different profiles are in perfect agreement with each other and therefore the newly developed model can very effectively predict the outline growth of the cake slab in various processing conditions. Related Articles | Metrics Select Analysis on structure and mechanical property of spray forming cake slab WANG Ai-min;ZHANG Yin;HE You-duo;WANG Yong-bin Steelmaking    2007, 23 (05): 37-40.   Abstract （2012）            Knowledge map    Save Spray forming is a kind of fast developing and brand new metal and alloy forming technology. This technology is not only in possession of the advantage of fast solidification, but it also can produce low segregated, fine grained, high density and nearnet shape cake slab with simplified process. Therefore the production cost of the cake slab produced by this technology can be dramatically reduced in comparison with that produced by the traditional powder metallurgical technology. The structure and grain size distribution of the GCr15 cake slab produced by the spray forming technology have been examined and analyzed by optical microscope and SEM. In the meanwhile the density and hardness of the cake slab have also been measured and analyzed. Results show that the structure of spray formed cake slab consists primarily of the isometric crystal and the distribution of its chemical compositions is relatively homogeneous. On the basis of the understanding proper measures to improve the microstructures and properties of the cake slab have been accordingly put forward. Related Articles | Metrics Cited: Baidu(4) Select Development and application of regenerative roaster for ladle preheating GAO Jing-chao Steelmaking    2007, 23 (05): 41-44.   Abstract （1943）            Knowledge map    Save In the present paper the working principle and characteristics of the regenerative roaster as well as application of this technology in 150 t steel ladle in Jigang have been introduced. In examining the conditions of the ladle lining roasted by various type of roasters the temperature rising curve of the ladle shell and the preheating temperature of the medium attained have been measured. Through examination of the actual results it's determined that by application of the regenerative roasting technology in baking the refractory material of the ladle the roasting time can be reduced and the desirable lining temperature of the ladle obtained as well. In the meanwhile the energy consumption can be lowered down and working environment in the steelmaking plant improved. Related Articles | Metrics Select Development and application of computer simulation software for HAN Zhi-wei;FENG Ke;WANG Yong;MAO Jin-hua Steelmaking    2007, 23 (05): 45-48.   Abstract （1584）            Knowledge map    Save Based on the structural characteristics of the billet continuous caster and the concept of finite thin section moving along the drawing direction a mathematical model of heat transfer in the process of CC billet solidification has been erected and the general simulation software for secondary cooling of the billet CC developed by Visual Basic 6.0. In the newly developed software are integrated the simulation and calculation of the temperature field and solidification of the continuous casting process, con algorithm for the water table of secondary cooling zones, regression of formula of the flow capacity and cast speed, input and output data processing and graphic processing. This software is featured of convenience in use and multifunctions, and therefore shows a very broad prospect of application in the research of the secondary cooling technology, CC production and engineering design. Related Articles | Metrics Select Application of numerical simulation in project engineering of FENG Ke;HAN Zhi-wei;WANG yong;MAO Jin-hua Steelmaking    2007, 23 (05): 49-52.   Abstract （1858）            Knowledge map    Save In the project engineering of slab continuous caster, the numerical simulation technique (slab continuous casting process static simulationbased software CCPS OFFLINE) has been used to optimize the water flow rate in the secondary cooling zones and theoretically predict the relevant important process/structural parameters such as the mould taper, segment gap and slab strain distribution. Certain positive results have already been put into practice in a specific steelmaking plant and very satisfactory achievements have been achieved and those achievements have been fully utilized in later new slab continuous caster project engineering. Related Articles | Metrics Select Practices in improvement of CC thin slab steel quality LU Sheng-yi Steelmaking    2007, 23 (05): 53-57.   Abstract （1588）            Knowledge map    Save The present paper introduces a few operating practices in regard to improvement in the CC thin slab quality such as elimination of the surface longitudinal and traversal cracks in the thin slab, reduction of the SEN clogging tendency, decrease of N content in steel and appropriate choice of mould flux. Related Articles | Metrics Cited: Baidu(2) Select Technological measures for increaseing the speed in slab continuous casting CAI Ning; DU Feng Steelmaking    2007, 23 (05): 58-62.   Abstract （1875）            Knowledge map    Save The present paper introduces the evolution history and status quo of the high speed slab continuous casting technology at home and abroad and reviews the technical measures adopted such as mold flux, mold oscillation pattern, control on the fluctuation of the liquid level of the nozzle and mold, electromagnetic stirring and large volume tundish and puts forward suggestions for increase in the drawing speed. Related Articles | Metrics Select Development and application of Compound dephosphorizer for converter refining ZENG Jing-hua;ZHANG Min;YANG Su-bo;GE Wen-sun;LIU Xin Steelmaking    2007, 23 (06): 1-4.   Abstract （1790）            Knowledge map    Save In light of the actual condition in Pangang Group the high efficient compound dephosphorizer is developed by use of the dephosphorizing technology “single slag process” in converter smelting. By application of this process the average dephosphorizing ratio reaches 89.41%, which is almost the same as that by the dephosphorizing technology “double slag process” in converter pretreatment and the phosphorus in the finished product in trial heat is less than 0.015%, and in the meanwhile the smelting period remains the same as ever before. The new technology can be used as effective technological support for consistently producing such a few steel grades as 350km/h high speed rail and so on for high speed railway purpose. Related Articles | Metrics Select Application of RH oxygen top-blowing technology in No.2 steel-making Plant,WISCO LI Dam-ing;ZHANG Wen-hui;LIN Li-ping;LIU Liang-tian Steelmaking    2007, 23 (06): 5-9.   Abstract （1432）            Knowledge map    Save This paper presents devices,opration techniques and application of RH oxygen top-blowing technology in No.2 steelworks WISCO. The RH oxygen top-blowing technology performs multi-functions such as decarbonizing,increasing temperature with Al added,cleaning slag in RH vacuum slot,etc.In steel-making process,the technology could decrease the product cost,increase the yield rate of metal,enlarge product scale in converter steelworks and optimize completely continous casting production. Related Articles | Metrics Select The BOF high efficient blowing process using on CSP cold rolling sheet producing SHEN Chang; PAN Yuan-wang;TAO Cheng-gang;ZHONG Liang-zhi Steelmaking    2007, 23 (06): 10-11,1.   Abstract （1745）            Knowledge map    Save The optimizing of LD process was discussed in this paper due to the high demand of [C],[P],[S] and steel cleanness on CSP cold rolling sheet and the unmatched convert cycle time with the CSP cycle time. Through optimizing the process model, the end [P],[S] a[O] were reduced, the end [C] and Temp. hitting ratio was increased, and the process of directly tapping was developed, the cycle time of convert and CSP was matched. In 2006 1.63 million ton cold rolled sheets was produced, nearly 69 % of the total output of CSP. Related Articles | Metrics Select Analysis on resulphurization in the process of hot metal desulphurization in No.3 Steel-making Plant in Hangang PAN Shu-min;DONG Jin-qiang;JU Jian-Tao;WANG Yu-sheng;CHANG Li-shan;GAO Wei-gang Steelmaking    2007, 23 (06): 12-15.   Abstract （1996）            Knowledge map    Save By analyzing factors causing to the hot metal resulfurization in the process of hot-metal desulphuriztion in converter refining the main reasons for resulfurization are determined to be primarily the inconsistency of the sulphur content in the hot metal, variation of alkalinity of final slag, existence of slag remainder in converter and hot-metal residue in the ladle. The proper measures are suggested in order to reduce resulfurization in refining low sulfur steel. Related Articles | Metrics Cited: Baidu(5) Select Analysis on causes to corner cracks in Q345B continuous casting slab XIN Jian-qing;YUE Er-bin Steelmaking    2007, 23 (06): 16-19.   Abstract （1613）            Knowledge map    Save The mechanical property of steel Q345B at elevated temperature is tested and the type of the precipitates existing at the cracks identified and thereupon cause to formation of the corner cracks analyzed and the processing measures to eliminate the defect accordingly put forward. Related Articles | Metrics Cited: Baidu(12) Select Study on mechanism of nozzle clogging in slab continuous casting of liquid steel refined by CAS－OB WANG Xiao-feng;CHEN Wei-qing;PEI Feng-juan;HOU Cheng Steelmaking    2007, 23 (06): 20-22,2.   Abstract （1701）            Knowledge map    Save Though the phase composition analysis of nozzle clogging samples from slab continuous casting and the inclusion detection in steel, the clogging mechanisms of submerged nozzle and long nozzle as well as slide gate have been studied by means of SEM. It‘s found that CaO•Al2O3 and CaS are the phases of submerged nozzle clogging, and CaO•2Al2O3 is that of long nozzle and slide gate clogging. Results show that it’s precipitation and adherence of the similar type of inclusions in steel to the inside wall of nozzle that causes to the nozzle clogging. The influences of m(Ca)/m(Al) and [S], [Al] contents in steel on nozzle clogging are discussed. For preventing nozzle clogging, it is suggested that the contents of [S], [Al] should be controlled below the curve of 12CaO•7Al2O3 creation and keep m(Ca)/m(Al) more than 0.13. Related Articles | Metrics Select Research and development of solidification and heat transfer model for baosteel 1930 mm slab continuous casting MEI Feng;RUAN Xiao-ming;WEN Guang-hua;TANG Ping;HAN Zhi-wei Steelmaking    2007, 23 (06): 23-27.   Abstract （1623）            Knowledge map    Save Based on the theory of two-dimensional non-steady-state heat transfer model and the law of heat dissipation in the secondary cooling zone of continuous casting, the heat transfer process in between the neighboring pinch rolls is divided into four different processes, namely heat transfers (1) by pinch roll contact, (2) by steam evaporation, (3) by water flushing and (4) by radiation. In light of the current condition of Baosteel 1930 mm slab caster, the mathematical model of solidification and heat transfer in slab continuous casting has been developed. By using the object-oriented computer language Visual Basic 6.0, the computer simulation software of secondary cooling in slab continuous casting has been developed. The infrared ray temperature measurement has been conducted to validate the results of model. The difference between the measured slab temperature and calculated one is less than 20℃,and the deviation range is well controlled within 1.0 %～2.5 %. All this shows that the simulation model and results are good and reliable. By using the simulation software, the secondary cooling system of Baosteel 1930 mm slab caster can be researched and optimized for guiding the practical production. Related Articles | Metrics Select Research on inclusions in billet continuous casting of steel ML08Al LIANG Fu-bin;LIU Xin-sheng Steelmaking    2007, 23 (06): 28-31,4.   Abstract （1934）            Knowledge map    Save In refining the cold heading steel ML08Al in a converter, shapes and behavior of the non-metallic inclusions have been improved and the quality of the steel raised by optimization of refining processes, particularly by examination of the continuous casting slab and thoroughly investigation in the morphology and behavior of the non-metallic inclusions in the cold heading slab ML08Al. In the meanwhile measures and methods to improve the quality of the products and cleanliness of the steel have been put forward. Related Articles | Metrics Cited: Baidu(2) Select Effects of antioxidant additive on carbon pickup of ULC steel from Al2O3-C refractory RUAN Guo-zhi;;LI Nan;ZHANG Zhi-hui; Steelmaking    2007, 23 (06): 32-35.   Abstract （1641）            Knowledge map    Save The effect of carbon containing refractory on the carbon pickup of ultra-low carbon steel (ULC) has been studied in an intermediate frequency induction furnace. In the experiments an Al2O3-C crucible is prepared using the white fused alumina and flake graphite as the starting materials with addition of various antioxidant. Results of the study show that carbon pickup of the liquid steel due to carbon bearing refractory can be very effectively prevented against by addition of certain antioxidant additives into the refractory materials. In adding different kinds of antioxidants to the refractory it’s demonstrated that the best preventative effect is shown on Al, and better is on Si and the worst is on SiC. The primary reason for the preventative effect of the antioxidant additive on the carbon pickup is found to be that by addition of the antioxidant additives the preventability of the refractory against hot metal infiltration as well as corrosion resistance of the refractory can be improved and in the meanwhile the diffusion of carbon in the hot metal has been reduced due to an increase in the viscosity of the hot metal. Related Articles | Metrics page Page 1 of 2 Total 46 records First page Prev page Next page Last page